Current, voltage, resistance: calculations related to Ohm law. Enter known values (e.g. voltage and resistance of conductor) and we'll show you step-by-step how to transform basic formula and find out missing value (e.g. current)

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This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

Choose a scenario that best fits your needs |

Current (I) | => | |

Voltage (U) | <= | |

Resistance (R) | <= |

Voltage (U) | Show source$230\ \left[V\right]$ | |

Resistance (R) | Show source$460\ \left[\Omega\right]$ |

Used formula | Show source$I = U / R$ | ||||||||||

Result | Show source$\frac{1}{2}$ | ||||||||||

Numerical result | Show source$0.5\ \left[A\right]$ | ||||||||||

Result step by step |
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Numerical result step by step |
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Units normalization | Show source$0.5\ \left[A\right]$ |

- The
**Ohm's law**states that the**electric current**is directly**proportional to the voltage**(i.e. the difference of potentials between the ends of the conductor) and**inversely proportional**to**resistance of the conductor**. - Mathematically, Ohm's law can be written in the following form:

$I = \frac{U}{R}$where:

**I**- electric current flowing through the conductor,

**U**- voltage applied to the conductor,

**R**- resistance of the conductor.

- For practical reasons, all conductors (and also any electric or electronic elements that may appear in the circuit) are divided into:

**linear elements**- meeting Ohm's law (in given circumstances), which can be called "ohmic",

**non-linear elements**- where Ohm's law doesn't apply (like diodes)

- It's important to note, that Ohm's law is stated as "for a conductor in given state", meaning that other cirumstances are intentionally ignored.

For example, the temperature change:

- if the voltage is increased, then the current will increase (by Ohm's law),

- this may potentially increase the temperature of the conductor,

- the resistivity of materials usually changes with temperature, so:

- if the material is a metal (like copper), then the resistance will increase and so will reduce the current,

- for some other materials (like germanium), the resistance will decrease and so will further increase the current,

- if the material is a metal (like copper), then the resistance will increase and so will reduce the current,
- in summary: the voltage increase changed indirectly also the resistance - additional factor to consider. It doesn't break the Ohm's law, but introduces additional factor (resistance change when temperature changes).

- if the voltage is increased, then the current will increase (by Ohm's law),

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